· The HEASoft 6.0.4 release is primarily driven by the release of the Swift software version 2.3, but also includes updates to several tasks in the attitude subpackage and to the FTOOLS and XANADU utilities 'xselect', 'extractor', and 'ximage', which have been revised to mirror the current development versions in use at the HEASARC. Also in this release are CFITSIO v3.004, an update to the CFITSIO Perl interface module v1.03, and the latest releases of Xspec (v11.3.2p and 12.2.1).

· As before, configuration-related changes thoughout the package means that users who already have HEASoft v6.0X installed will need to completely replace their software installation; there is no clean way to simply overlay this new release or to update an existing installation.